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| Numeral simulation and experimental study on cavitation behavior of hydraulic retarder model |
| DONG Liang1, XIAO Jiawei2, MING Jiayi1, LIU Houlin1 |
| 1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.NR Electric Power Eletronics Co.Ltd., Changzhou, Jiangsu 213025, China |
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Abstract To study the cavitation behavior of hydraulic retarder, the RNG k-ε turbulence model and Zwart-Gerber-Belamri cavitation model were chosen to simulate the cavitating flow in a single channel of a retarder model when the outer wall of the pump impeller was subject to different pressure levels based on ANSYS CFX. Additionally, a test stand was established to carry out performance tests at reduced pressure levels, and the predicted performance was compared with the measured values to validate the accuracy of numeral simulation. The results show that the error in prediction is 3.24%, indicating the retarder with a better internal cavitation characteristic. With the decrease of pressure on the outer wall of impeller, the vapor first occurs on the blade suction side close to the hub, and then develops toward the middle of blade till covers the most area of the suction side. The vapor is distributed in the radial direction unevenly. The dimensionless cavity area(Sc/S)increases first and then decreases with the increase of radial position(r/R)when the external wall pressure is at 0.25 MPa. The cavitation near the hub position(r/R=0.3-0.5)is more serious.
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Received: 21 December 2015
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